External-Voltage-Free Dielectrophoresis of Liquid Crystal Droplets
AbstractThis work reports, for the first time, a dielectrophoresis (DEP) effect-induced motion of liquid crystal (LC) droplets in an LC/monomer mixture sample with a poly-(N-vinyl carbazole) PVK-coated substrate without an external voltage. With the UV pre-irradiation of the PVK layer through a binary mask, a laterally non-uniform electric field can be induced between the pre-illuminated regions and the neighboring non-pre-illuminated PVK regions near the borders of the two regions. The phase separation occurs once the temperature is lower than 50 °C and the LC droplets can form in the sample. The pre-formed non-uniform field provides a DEP-like force to manipulate the small LC microdroplets in the pre-illuminated regions to effectively migrate to the adjacent non-pre-illuminated regions. The continuous supply of the LC from the pre-illuminated regions to the adjacent non-pre-illuminated regions significantly increases the diffraction efficiency of the grating sample. This study provides an insight into developing new external-voltage-free DEP-based devices that can be applied on various fields, such as photonics, displays, and biomedicines. View Full-Text
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Wu, S.-K.; Mo, T.-S.; Lin, J.-D.; Huang, S.-Y.; Yeh, H.-C.; Chen, L.-J.; Lee, C.-R. External-Voltage-Free Dielectrophoresis of Liquid Crystal Droplets. Crystals 2017, 7, 202.
Wu S-K, Mo T-S, Lin J-D, Huang S-Y, Yeh H-C, Chen L-J, Lee C-R. External-Voltage-Free Dielectrophoresis of Liquid Crystal Droplets. Crystals. 2017; 7(7):202.Chicago/Turabian Style
Wu, Sheng-Kuang; Mo, Ting-Shan; Lin, Jia-De; Huang, Shuan-Yu; Yeh, Hui-Chen; Chen, Lin-Jer; Lee, Chia-Rong. 2017. "External-Voltage-Free Dielectrophoresis of Liquid Crystal Droplets." Crystals 7, no. 7: 202.